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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8eb691e19a99909f6a462550d8eae4478c20398a656bcc332d3711b7b8a709' 
  AND token = 'zhMyyPih5uAMX19inuR/hUdyi2aC5PEglIrS6ioGD8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}